PES Erase used to be common for people that ran PH cycles. I don't know if what they had in the original formula is banned now, but I do know they changed it.
The best "legal" AI would be arimistane. Would be a good option if you are not sensitive to estrogen. If PES worked for you, this probably will.
Aromasin and Adex are not really illegal. They are in a very grey area of legality. They can be sold in liquid form for research purposes, but not for human consumption. In pill form, they are technically illegal without a script, but I highly doubt you will get in trouble for having breast cancer drugs on you. But, the list of how you could get in trouble with them is long. The worst would be having counterfeit meds with intent to sell.