I did a quick check of all the 3 letter words still available (Actual words not every combination) Most of them suck but you might find something you like :p
AAS, ABA, ABO, AFF, AFT, AHI, AIL, AIN, AIS, AIT, ALS, AMU, APO, ARF, AUK, AVO, AWL, AWN, AYS, BAA, BAH, BAP, BES, BIB, BRR, BUR, BYS, CAD, CAW, CAY, CEP, CIS, COB, COY, COZ, CRU, CUD, CUR, CWM, DAW, DEF, DEY, DIB, DIF, DIT, DOL, DOR, DUP, EBB, ECU, EDH, EEL, EFS, EFT, ERG, ERS, ESS, ETA, EWE, FAS, FEH, FEM, FET, FEU, FEY, FEZ, FIB, FID, FIE, FIR, FOH, FOP, FOY, FUG, GAE, GED, GEY, GHI, GIB, GID, GIE, GIP, GIT, GNU, GOB, GOR, GOS, GOX, GOY, GUL, GUV, GYP, HAP, HAW, HEH, HEP, HES, HEW, HIC, HID, HIE, HOB, HOD, HOY, HUP, ICH, ICK, IDS, IFF, IFS, IGG, IRK, JEU, JUS, JUT, KAB, KAE, KAF, KEF, KEP, KEX, KHI, KIF, KIR, KOA, KOI, KOP, KUE, LAC, LAT, LEK, LEY, LEZ, LOB, LOP, LOX, LUG, LUM, LYE, MHO, MIS, MOG, MOT, MOW, MUN, MYC, NIB, NIM, NIP, NIX, NOG, NOH, NTH, OAF, OAR, OBA, OBE, OCA, ODA, ODE, ODS, OES, OFT, OHM, OHO, OHS, OLE, OMS, ONO, ONS, OOT, OPE, ORT, OSE, OUD, PEC, PED, PEH, PES, PHT, PIS, PIU, PLY, POH, POX, PRY, PSI, PST, PUD, PUL, PUS, PYA, PYE, PYX, QAT, QIS, RAS, REM, RES, RET, RHO, RIG, ROE, RUE, SEG, SEI, SOP, SOT, SOW, STY, SUK, SUQ, TAM, TAS, TAU, TEG, TET, TEW, THY, TIL, TIS, TUI, TUN, TUP, UDO, UKE, ULU, UNS, UPO, URB, URD, URN, URP, UTA, UTS, VAC, VAR, VAT, VAU, VAV, VAW, VEG, VIG, VIM, VIS, VOE, VOW, VOX, VUG, VUM, WAB, WAE, WAG, WIS, WOG, WOK, WOS, WRY, WUD, WYE, WYN, XIS, YAG, YAR, YAW, YEW, YID, YIP, YOB, YOD, YOK, YOM, YON, YOW, ZAS, ZAX, ZEK, ZOA, ZUZ