The eBay pump looks an awful lot like the $10 Walmart pump taken out of the case, fan trimmed off and a Powerlet plug on the end instead of the cig plug it came with. For the price they ask, they make a nice profit, even if they are buying at retail prices. And Auto Zone has sales on the Slime pumps all the time for $10 or so.
Don't over think this. Buy the pump and you can help people w/o stranding yourself. Not to mention what the others have said about checking/adjusting your own pressure on the road, etc. I have a WalMart one, and have used it a dozen times to help other people. Still going strong.
C02 can be great. Unless you have two punctures, just used them to help someone else and now have your own flat, have a slash that you thought you fixed, but didn't, etc. Heck, carry both if you have the space and want to spend the money.
You don't need to spend $100 on a pump. You can if it makes you feel better, but you don't have to.
Don't over think this. Buy the pump and you can help people w/o stranding yourself. Not to mention what the others have said about checking/adjusting your own pressure on the road, etc. I have a WalMart one, and have used it a dozen times to help other people. Still going strong.
C02 can be great. Unless you have two punctures, just used them to help someone else and now have your own flat, have a slash that you thought you fixed, but didn't, etc. Heck, carry both if you have the space and want to spend the money.
You don't need to spend $100 on a pump. You can if it makes you feel better, but you don't have to.