WordNet (r) 3.0 (2006):

subscribe to
    v 1: receive or obtain regularly; "We take the Times every day"
         [syn: subscribe, subscribe to, take]

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "subscribe to":
   OK, abide by, accede, accept, acclaim, accredit, acquiesce,
   acquiesce in, affirm, agree, agree to, agree with, amen, applaud,
   approve, assent, assure, attest, authenticate, authorize,
   autograph, back, be sponsor for, bond, buy, certify, cheer, comply,
   confirm, consent, cosign, countersecure, countersign, endorse,
   ensure, give permission, give the go-ahead, give the imprimatur,
   give the nod, give thumbs up, guarantee, guaranty, hail, hold with,
   in toto, initial, insure, nod, nod assent, notarize, pass, pass on,
   pass upon, permit, ratify, receive, rubber stamp, sanction,
   say amen to, seal, second, secure, sign, sign and seal, sign for,
   sponsor, stand behind, stand up for, support, swear and affirm,
   swear to, take kindly to, undersign, underwrite, validate, visa,
   vise, vote for, warrant, welcome, yes, yield assent