i need an answering machine with atleast 20 minuts outgoing message ability,can you help?

my trusty panasonic now says err every time i go to record a new message,it is for a hotline that partners call for updates. we have very little cash, were in west los angelos, so we can drive as much as 1 hour but nomore. panasonic sugeested a 4 line phone/answering system cause it has 100 minutes for outgoing, but the 500 dollars was way outside our budget. before our current machine,we had a machine that had the name fridays or something like that, but it lasted only 1 year.we could use 25-30 minutes if its out there, (especialy if you can do press 1 for !!! pres2 for $$$ etc) but so far the closest thing we have found only gives 18 minutes, and is a phone/machine all in one(panasonickxtg9331) which means if people start leaving msgs, it could quit giving the outgoing msg untill msges are deleted.
the purpose again is for recorded updates, we can barely afford over 100$ but we definately cant afford to be without.
this is first time ive used this google ask,i hope im doing it right