Hi JETninja
Firstly I hope you have a fantastic time during your cruise and please don't forget to post some images upon your return ! Might I tactfully suggest that for the sake of simplicity whilst also taking into account your limited budget, the best idea would still be to obtain a sufficient number of additional quality brand-name SD cards to take with you as originally intended ? Prices are so incredibly cheap compared to some years ago that this really shouldn't be an issue nowadays.
Warning: Don't wish to worry you unduly, but
really thought you should read the following post below regarding Bestbuy !!!
https://www.pentaxforums.com/forums/pentax-camera-accessories/53884-counterfe...-best-buy.html
Obviously any choice you make about the storage capacity of the card(s) purchased ultimately remains your decision, but personally I have always erred on the side of caution and restricted myself to a maximum size of the 2GB ones. Admittedly it's fairly unlikely, but should Sod's Law ever strike and the card fail for whatever reason, then at least you might potentially have only lost a few hundred images, whereas the prospect of losing
literally thousands of
irreplaceable photos in one fell swoop with an 8Gb card really doesn't bear thinking about ? Regrettably, such things can happen……sad but true !
Bwield's idea of a obtaining a Netbook is not entirely without merit, but somehow I seriously doubt whether you'd find a brand new one for $100.00 ? Should you plan on travelling regularly to foreign climes in future and can justify the additional financial outlay, then probably in many people's opinion the best of the current bunch of these mini-laptops would be Samsung's NC10, which reportedly has an amazing 7hr battery duration (6-cell LI-on).
http://www.amazon.com/Samsung-NC10-14GB-10-2-Inch-Netbook-Processor/product-...DateDescending http://www.google.com/products/catalog?q=Samsung+NC10&sourceid=navclient-ff&...478#ps-sellers
However, do bear in mind that unfortunately Netbook's don't include integral CD/DVD burners, which further adds to the cost and bulk (external/portable burner + blank discs) of yet more stuff to carry around with you !
Lastly
Tom S's idea about the Digital Foci Photo Safe II 80GB Data Storage Unit is also worth considering, but at the end of the day it still remains a portable hard-drive and as everyone knows, hard-drives are still prone to catastrophic failure or damage.
Best regards
Richard