At Party Expert Ste-Thérèse, you’ll find a huge selection of costumes for adults, children, and babies, as well as seasonal and themed decorations for all occasions. From theme costumes (police, vampire, witches) to TV & Movies costumes (Harry Potter, Minecraft, Lilo & Stitch), we have everything you need to satisfy all tastes.

Our Sainte-Thérèse party store is open:

• Sunday 10 a.m.–5 p.m.,
• Monday–Wednesday 10 a.m.–6 p.m.,
• Thursday–Friday 10 a.m.–9 p.m.
• Saturday 9 a.m.–5 p.m.

We extend hours to 9 p.m. Monday–Friday in the days leading up to Halloween for your party supplies needs in Sainte-Thérèse. Check our site or call for holiday updates.

Yes, we provide helium balloon inflation services at our Sainte-Thérèse party store for latex, foil, and other types you bring in. Pricing is based on helium used per balloon, with competitive rates starting affordably. Availability may vary due to shortages—call ahead to ensure we can inflate your helium balloons in Sainte-Thérèse.

As a specialized party store in Sainte-Thérèse, we offer a wide range including balloons, costumes, costume accessories, kids' birthday items, disposable plasticware, age-specific birthday supplies, theme party decorations, cake supplies, pinatas, general birthday products, Halloween items, toys & games, Christmas decorations, baby shower supplies, greeting cards, candy, everyday entertaining, plushes, New Year items, graduation supplies, wedding products, gift wrap & bags, 1st birthday themes, fireworks, candy bars, Superbowl gear, bachelorette items, retirement supplies, novelties, bridal shower products, lights/special FX, summer themes, wedding anniversary items, Eid supplies, Easter products, Valentine's Day items, religious items, St. Patrick's Day gear, sports themes, St-Jean-Baptiste supplies, Pride items, Hanukkah products, Mother's Day gifts, Canada Day decorations, Thanksgiving items, Diwali products, spring themes, Chinese New Year items, and Mardi Gras gear. No unique location-specific items at Galeries Laval.

Yes, balloon delivery is available from in-store purchases at our Ste-Thérèse party store or via https://ballon-expert.ca/ for local delivery of inflated balloons, using Uber or internal services based on order size. We don't offer party planning, costume rentals, or event setup, but our experts can provide recommendations and tips on party supplies and helium balloons in Sainte-Thérèse. Pricing starts at affordable rates—contact us for details.

Final sales on helium balloons at our Sainte-Thérèse party store. For unopened items in original packaging, we offer a 10-day return policy for exchange or refund. Special Halloween return policy applies. Check with the store for details on party supplies returns in Sainte-Thérèse.

We accept cash, debit cards, Visa, and Mastercard for all purchases, including party supplies and helium balloons, both in-store at Ste-Thérèse and online.

Contact the store directly during business hours or our customer service (Monday–Friday 9 a.m.–12 p.m. and 1 p.m.–4:30 p.m. EST) via email at info@party-expert.com or phone at 438-771-7224. Use our online form for inquiries about helium balloons or party store details in Sainte-Thérèse—phone is preferred for urgent questions.

Not currently available, but in-store pickup is coming in 2026. For balloons only, check https://ballon-expert.ca/ for stock pickup and local delivery options at our Sainte-Thérèse party store.

Subscribe to our newsletter for exclusive offers and promotions on party supplies, helium balloons, and more at our Sainte-Thérèse location. No current loyalty programs in store. My Party Points program is only available online at this moment, coming in 2026 in store.

We offer helium inflation for brought-in balloons (latex and foil) and delivery services via in-store or https://ballon-expert.ca/. Professional care ensures ideal inflation, perfect for your party needs in Sainte-Thérèse. Restrictions may apply due to helium shortages.

While we don't offer formal party planning, our experts at the Sainte-Thérèse store can provide tips, product recommendations, and ideas for themes like birthdays, Halloween, or weddings. Visit or call for personalized advice on party supplies in Sainte-Thérèse.

Our party store in Sainte-Thérèse has standard accessibility features. Use our store locator for directions.