In response to your first question.. boot fairs and dvds don't mix!
People at boot fairs are looking for bargains, and are not willing to pay over £5 for a DVD, I have access to probably the cheapest suppliers in the UK and you cannot sell for profit at bootfairs unless you are selling either old stock, or second hand stock.
If you want to get off ebay then I would suggest getting your own website but to be honest you are never going to be able to compete with the big companies who can offer, 1) 40,000 titles and up.. 2) Prices sometimes cheaper than the wholesalers themselves....
Trust me stick with ebay and work to sell 200 dvds a week and you will make a tidy income as long as you get the right titles at the right price...
Considering you have only 24feedback it would suggest that you are relatively new to it all.. I have 6000 odd feedback and make a tidy sum on ebay selling dvds so you can do it...just about.. anyway

!
http://search.ebay.co.uk/_W0QQfgtpZ1...rcleQ5ftrading
Thats my link.. see for yourself...
With regard to supply, I am afraid I cannot help. Check out a few wholesale lists, and do a search on this forum and you should be able to find some decent suppliers, however you won't be able to buy 5 at a time. To get DVDs at a decent price to re-sell on ebay you should aim to spend around £1000-£1500 with your supplier each week...
Hope this helps, feel free to ask any more questions..
Anthony