>I am going to link up with a store soon, they take 25-35% though (ouch!).Keep in mind as you go along that you're trying to get the most exposure. Consider the 25-35% as an advertising fee. Selling repairs and such online are one thing. Selling complete amplifiers where neither the prospective buyer nor anyone he/she knows has any idea what it sounds or plays like is a different animal.
You know how it is - think of your favorite production amp. Great amp with great sounds and reliability, right? Now think of how many other people think it sucks. Selling something as subjective as an amp sight-unseen (er, sound-unheard) takes the risk of selling to someone who just won't like it. If that person is a review poster, i.e. Harmony Central, etc., they won't help you any. I've seen reviews - both good and bad - of my amps from people on other forums and elsewhere who've never even seen it, much less played it.
On the other hand, if you have an amp sitting in a store with players coming in regularly that plug into it, everybody within earshot gets to hear it and the player that walks out with it knows what he's getting. I've hung up my commercial attempts at amp building at least until I retire, but people I've never met before still talk and ask about my stuff. I need more time to devote to kicking things into a high enough gear to make it financially worthwhile. Still, though, the seeds are planted, it didn't cost me that much, and I've got a lot of players out there who know me - even if I don't know them.
I'll also say that be cautious of giveaways and sponsorships no matter which way you go. I've decided that promotional giveaways are a complete waste of time and I'll never do it again. Sponsorships can be the golden ticket, but you have to be very selective if you do this and have a little luck. I have no luck myself, so I shy away from it. Still, if there's a top band in your area that plays a regular circuit, has a firecracker guitarist, and you can get them to play one of your amps in exchange for onstage and banner promotion, that's something to consider. Get it in writing with an effective time period you can live with. You
don't want to have to go get that amp under unfavorable conditions.
Last thing, when you're ready to kick it into high gear, don't underestimate a press release. The Internet turns over fast, yes. Even so, I stopped trying to break into commercial production about a year ago and there is still quite a bit of stuff floating around out there about my gear. For example, here's a Google search I just did:
Monster Factory Amplification. Did I mention that you should do a press release? If web exposure is what you're after, this will go farther than an ebay ad. There's stuff out there about my amps in languages I can't even read.