I just noticed that if you search the ScotlandsPeople index for a death record of a woman and find a promising one, but no mother's surname or maiden is given, you can do the following.
1. Note the reference number for the record of interest.
2. Search again just using the forename (leave surname blank) and the exact year of date and registration location for the death record you found
3. Use the "find" command in your browser and search for the record number. I've done this twice today, and both times came up with the maiden name without having to buy the record.
For instance, I was looking for an Elizabeth Thomson who reportedly died in Old Machar, Aberdeenshire shortly after the 1891 census. Searching for deaths there, I found an Elizabeth Thomson of a reasonable age who died in 1891, but I didn't know if she was the right one. So I searched again just "Elizabeth", no surname, and year range 1891 to 1891, district Old Machar, and there were *two* records listed with the id 168/2 545, one for Elizabeth Thomson and one for Elizabeth Mill.
Probably some of you know this, but I was happy to realize it. It will save me some money!