As I mentioned before, letterpress invitations don't fit in a tight budget, however these little 2x2 letterpress monogram tags are a nice compromise. And at only .25 each ($2.50 for 10), they'll work within the tightest budget. They'd be perfect for embellishing anything from gift bags and favors to invitations or display tables.
They're on sale now but I'm not sure how long they'll last! Most letters are available in colors of pewter, blossom, twilight, pool, and moss. You can find them here. Even when they're all sold, you could still have them made for a fraction of the cost of a full letterpress invite.