Walmart offers the LEGO Ideas The Big Bang Theory Building Kit, model no. 21302, for $45.76. (Amazon has it for the same price with free shipping for Prime members.) Opt for in-store pickup to avoid the $4.97 shipping fee. That's $2 under our January mention and the lowest price we could find now by $8. This 484-piece set features seven mini figures (including Penny, Raj, and Amy Farrah Fowler) and a variety of accessories.