I just got the Ibanez Tone Lock series TS7 Tube Screamer brand new for $40CAN.
It's basically a TS9 with a boost switch. Sounds amazing. Unfortunately in the shop they didn't have any fresh batteries and it was crapping out on me. Hopefully this was just due to the low battery and all will work fine when I test it at home.
If the issue I saw in the store is just the battery, it's much more bang for the buck than paying nearly $200 for a TS808 or TS9.