Upload & Sell: Off
i have $$$ paid on the layaway with a small balance left. unless someone is willing/wanting to buy the t1i from me, i'm stuck with it until i put it up f/s.
A general rule: It is almost always a really bad idea to give a vendor money on a lay-away or deposit basis unless you truly have to do this and you are utterly certain that you will make that purchase and you have a firm, fixed, unchangeable price.
Otherwise, once the vendor has any of your money in hand, the ball is entirely in the vendor's court. They have no reason to bargain any further with you, even if the product becomes available at a lower price. If you want to change the terms of the sale, they have no reason to help you out - and a slightly unscrupulous vendor may take you to the cleaners when it comes to the marginal cost for the better item.
In the worst case, if you don't make a deposit or do a "layaway" deal, the item could be sold before you get there. In a few cases - a rare and precious item, possibly - this could be disappointing. But when it comes to something as generic and widely available as cropped sensor cameras, if the one you saw is gone there will almost certainly be another one available elsewhere at the same or better price.