You may want to have a look at this then (when/if they get any back in stock). I have not used one, but the spec does not look too bad if it is just keeping copies of your slides/negatives.

http://www.7dayshop.com/7dayshop-portable-high-resolution-35mm-film-slide-scanner-with-2-4in-lcd-screen?backUrl=L3Bob3RvLXZpZGVvLXN1cHBsaWVzP2NhdD01NzEmcHJpY2U9NSUyQzEw

RMR

Sorry to disagree but do look up reviews of this type of product (and there are quite a few variations) before buying, it is a camera rather than scanner and the reviews say it cant cope with Kodachrome and quality is poor with a blue cast a common problem.

I refer to my original advice, invest in a dedicated scanner for your 400+ slides, sell it after to regain most of your outlay.

Be aware however that scanning 400 plus slides will be a time consuming task, best done in batches over a period of time.