These also come up from time to time on ebay, but be very careful about what you are bidding on. A lot of listings claim to have rolls for the 113 cars but are just rolls from the sedans of the era. A kit for the 600 (also different) just sold for about US$ 525. A good kit for the 113 may run you in the $300 range.
Do a search using "toolkit" and you will find several very good pictures to show the standard 113 tool roll, which could be in vinyl, canvas, or (rarely) leather, what ever happened to be around that day.
Jonny B
1967 250SL Auto