Transportation from amarillo airport to clovis new mexico?

what could be the cheapest? taxi, limo? what?

I doubt both. U could be better of taking either a bus or a rent a car. I believe it is like a two half hour trip between the two towns

checking superpages I found this
it was late to call them and they don't seem to have email

High Plains Shuttle
2700 Mabry Drive, Clovis, NM 88101
map driving directions

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phone: 505 762 8343
you may also fly there as well

TNM&O also does this routing twice a day
one at 1:30a in the morning and arrives at 2:30am
and another one at 12:50pm and arrived at 1:50pm
cost could be $28.00

I could propose using Amarillo Transit into downtown, then TNM&O Coaches from there. TNM&O leaves from the major bus station twice a day to Clovis and time & fare information may be found at tnmo.com Good Luck.

You could attempt at LimoZu.comLimoZu.com">LimoZu.com . they'll compare all the limo services in you area. Just click all the limo you like and compare for the lowest price. The limo service will take care from A to Z to the airport with worry free, and you'll feel like someone every important. Some limo service cost around $35/hr up and sometime may be cheaper then taxi.