heres a suggestion for those on a budget, after pumping up two kites every time i go kiting with my other half, i bought a 12 volt $20.00 air bed pump it inflates it about 80 % and three - six manual pumps to harden it up ready to go.
you buy them at ranger camping use it to plug into your cig lighter or have one of those battery packs if car is not next to where you need to be.
works well if you go for a couple kites day in summer