It's been so long since I had an AV Booster and Tennokoe II that I thought they were more or less the equivalent of the TurboBooster and TurboBooster Plus.
Sadly, it looks like the AV Booster has suffered the Magical Chase effect and is now being gouged because collectards valued the TurboBooster based on perceived rarity. :/
If you're considering paying for a TurboBooster, you should instead get an RGB modded Tennokoe II from mickcris. He usually sells them for $70 and I believe that he can either include a composite port or a composite cable compatible with the RGB port.