I want to buy a linksys WRT54GL router and i cant find it ,, is there any way i can have it !new or old?

i am doing wifi robot for my final project..i want to buy a linksys wrt54gl for my final project ...n i live in pakistan..it is not available in my country now old or new.. can anybody help... can i use some other model exactly similar to this one ..??? whih supports OPENWRT...