You can buy super old random left over stock on clearance at some well-known online retailers.
If you were looking for camo stuff BT has a new line out that's very inexpensive. The pants have knee padding and both jersey and pant seem to be of good quality. They probably wouldn't survive a season of hard speedball play with slides and dives and crazy ****, but they'd definitely last a long time in recball.
Check ansgear. I've gotten some pants and a jersey from them pretty cheap before when they were having one of their big sales. I went on there a couple weeks ago and they had some Valken jerseys for about $8.