the consensus is rather obvious....
HOWEVER - most of the posters on here are partially wrong. When you enter into a sales agreement, depending on the state too, you agree to pay the rate that is agreed upon. If you had a verbal commitment, or the product was clearly labeled with a price, and the price that was charged is lower than what was 'agreed' upon, then you ARE legally liable to pay them.
They have the option to take you to small claims court, in some locations - charge your debit/credit card, and if they so choose - sue for 'damages'.
now, you have to realize that these laws are in place for $.01 - 9,999,999 priced items. So while it may sound crazy for a $250 transaction, a $10k transaction where the profit margins are VERY slim, would entice a retailer to recoup their losses.
For example, many many retail items are sold with a profit margin of less than 50%. Usually accessories are the only items that are around the 50% margin, and thus they push those items heavily. Hell, Best buy endures because they sell alot of VERY overpriced accessories for example, while their tv markups are about 3-20% on average. Better yet, take all the stuff back and ask for your money back completely. Buy everything online or support another store. Don't make a scene as , it's a small world and you never know when you will need to work with someone from that location or, need something from that place desperately for example.
The burden of proof is on the party attempting to recoup their loss , keep in mind.
If you signed an invoice for example, showing the price as say $250, you received a copy and they kept a copy; however, they only charged you $150 - it's well within their rights to charge you the other $100. It's up to you if you want to chalk it up to it was a human mistake by a human being, and not some evil corporation playing games with you to get more money so they could light cigars with $100 bills.
In your case, for what they are asking, I would ask if it was a prank. There has to be more to this story that we are not hearing, I don't think the OP is being completely forthcoming on this; however, if he is - then the retailer asking for $20 more due to underpayment, is simply ON CRACK. Tell them to go pound salt.
Last edited by Sincraft; 11-09-2012 at 12:49 AM.