First thing I'd ask myself is, can I really use this animal in my plans, or am I just jumping at the good deal? I learned my lesson, and my racks were overflowing with impulse purchases within a year, that I had no idea what I'd do with as far as breeding plans. Focus is hard.
If it passes that test ...
Any way you can put a down payment on it to hold it until you can come up with the rest?