Two electric pumps under $50
I have the Aerostich Mini Compressor, it is a great pump for the money, $45. Aerostich is also selling a Stop and Go Compressor for $35, if they had offered it when I was in the market. The Cycle Pump Air Compressor works well for a pricey $100.
Looking for belt and suspenders...
[QUOTE=marchyman;636619]If I've got the panniers on the bike (usually) then I've got an air pump. I do not run the pump unless the engine is running.[/QUOTE]
I've never had a problem with my CyclePump run from the battery on my R75/6, but a Vespa P200 has a smaller battery and a MUCH weaker stater, so weak that you can't run higher than 35w headlight bulbs. With the engine running, it still ran the battery flat.