Hey, I ve taken my NA around a 1 month ago and im interested in NA:S now. So I bought the Barker/Morris Study Guide, and I have already some "trash" equip like 2 ancient 2500 routers and 1 2960 switch. The problem is that I see from the book a LOT of GUI stuffs and configurations of IPS/FW things therefore I need a way to experiment. ASAs are not cheap and through GNS I do not have a proper image for using it with SDM (for using IPS/IDS modules etc). I found some pix in fair prices but I know that cisco isnt producing anymore and actually have stopped the support also. Could pix replace an ASA for such purposes?
So what should I do now?

Im kinda stuck, because I have already read the 4/5 of the study guide and also have seen a lot of videos in youtube etc and I do not have a way to try these things out...
Thanks in advance!