I usually finish off the end of a roll of slide film by making a few maps of where I’ve been, have a look at this tutorial to see how to go about it, it does work and it’s fairly cheap to do. http://www.crystalcanyons.net/Pages/TechNotes/ShootYourMonitor. shtm
The best value lab I’ve found at ??Æ’?¢?‚¬Å????€š?‚?£1.25 a go is Micro-Quiz
http://cgi.microquiz.force9.co.uk/phpshop/products.php?id=1 or ??Æ’?¢?‚¬Å????€š?‚?£1.00 if you can get a discount http://cgi.microquiz.force9.co.uk/phpshop/products.php?id=10
Micro-Quiz, 35, Shrewsbury Rd., Worksop, Notts., S80 2PA.