I may be a bit late but, depending on what you want to do with the slides, I'd suggest considering the digital route:
I took slides throughout my Africa trip for fun and for my website. I too made the mistake of getting them developed as I went:
Cape Town - ok,
Harare - ok
Dar Es Salam - good
Nairobi - crap
If you do get them done locally only get one roll done first. if thats ok give them the rest, in batches.
- it is a pain finding and storing film.
- costly to send it home (work out your cost per roll - film/shipping/developing, it's high.)
- how long will it take you to develop/mount/sort/anotate 100's of rolls when you get back home? - You may have a lot more time when on the road.
I started with a small digital to see what is was like.
- I now have the digital slr equivalents of my film cameras.
- I can take 250 (2gb card) and 50 (500mb) photos at the highest raw setting.
- From photo to viewing is very fast.
- I've just come back from the galapagos and downloaded the photos (100-150) and created an island page every day.
- How much will you rember several months later?
- I can update my website every couple of weeks.
- I never have to buy film again and am so happy i dont have to worry about the costs.
- I send lots of cd's home instead
- I copy the raw files to an ipod.
- I carry chargers and need power to recharge the batteries.
But i don't regret leaving film for a moment.