While Prime Day is offering plenty of great discounts this week, Amazon isn’t the only retailer kicking off the summer with steep price cuts. Walmart is running its own competing sale with hundreds of noteworthy deals, including a discount that drops the popular Lego Marvel Spider-Man vs Oscorp set to $95 (was $140). Walmart’s sale runs until June 28, but there’s always a chance this deal could sell out before then. Lego Marvel Spider-Man vs Oscorp (808 pieces) $95 (was…