I really advise you to look around for a nice weanling or yearling. Breeding just because you can't do anything else with her is really not a good idea. There have been times when I've thought that if I got a mare it would be nice to breed her and I could keep the foal and raise it. But then you also have to remember that if you want a real good foal the mare and stallion need to have good conformation, good temperments and it is good if they have proven themselves. And there is also the risk of losing the mare, the foal or both of them. Would you be prepared for those kind of vet bills and heartache? I know I wouldn't be at the present.
There are weanlings I've found on Kajiji and Craigslist that are $100 - $150! I could easily afford that. And that way you can see the foal before you get it, choose the sex, temperment, color ect. There are just so many horses in the world that need loving homes, I think it is not very responsible to just breed without really thinking it all through and making sure you are bettering the breed.