Generally, yes, we will offer cash/check or store credit for your unwanted LEGO®. Items need to be in sellable condition, and reasonably clean - also free of smoke damage/odors, and free of non-LEGO® items.
We receive a ton of requests to buy LEGO® though, so we do have to be careful with our budget and we always have a massive backlog of inventory to process. This means we are somewhat selective with what we take in, and we won't be able to offer you top dollar for it. We have to be able to maintain a profit margin too.
It's not realistic to expect a store to pay eBay "sold" or Amazon "Buy Box" prices - these are the prices we would be SELLING them for, AFTER we do all the work to get them ready for sale.
We handle things on a case by case basis, but we use the Bricklink 6-month Average Price Guide to determine value of complete sets and individual minifigs. We will typically offer UP TO 50% of the 6-month average, but exact amount depends on condition and how fast selling the item is, so our offer will generally be closer to 30-40% of the average. We will also offer a lower amount on USED sets, as these are very time consuming to process and we get flooded with them.
How tight our budget happens to be at the time is also a factor, which may result in a lower offer. We will sometimes offer a slightly higher amount for store credit vs cash/check.
For used bulk, we will offer UP TO $3/lb. In rare cases possibly more, if it's already category sorted (we DO NOT pay extra for color sorting) or contains a lot of rare pieces or minifig & animal parts etc. If we see a lot of fake LEGO®, broken/damaged pieces, or other toys or garbage in the mix, this will hurt the value substantially since we cannot sell non-LEGO®, and it takes us a TON of time to carefully screen all the pieces before we can sell them.
Please keep in mind, we are under no obligation to purchase your LEGO®. We reserve the right to refuse to purchase any item for any reason we choose.