Do your homework: Thoroughly research the various brands and products before making a purchase. Chances are, the site specializes in Bangladeshi products and has lower prices than you would find at your local store.
Use search engines like Google to look for Bangladeshi products and compare prices. You may also be able to find coupons or promo codes that will save you even more money.
Check out online retailers: If you don't have time to shop online, try checking out online retailers like Amazon or eBay. Many of these retailers carry Bangladeshi products at discounted prices.