I think I took advantage of
COMPBONUS when it originally came out. Of course, I will give it a try again because of the new year. Louie likes free money. (Geez, now I'm talking like you...) IIRC, COMPBONUS is max $100 w/ 5x raked hands, right? 1000 hands isn't too bad. Easily done in two sessions if you 4-table $100NL like me.
Another bonus code to try out is
IGMPAY. I was offered this bonus code after complaining - when I got disconnected from Party (their fault) and I couldn't re-join the tournament. The only "thing" is: you have to deposit via IGM-Pay, which means you'll have to link up your bank account. I can vouch that it works fine.