Something to consider for you is a trip to one of the genealogy centres (the main ones being in Edinburgh or Glasgow) where you are able to view images on line for certificates after the standard cut off dates that you have, as shown above. For a day's booking (varies but c. £14) you can view on line as many certificates as you possibly can on the day. Might work out cheaper in the long run, so something to consider in your research.
Go for the Scotland's People Centre in Edinburgh.
(a) It's seriously easy to get to - a great conspicuous building just across the road from the railway station, in the next block to the bus station, and on just about every city bus route.
(b) The Glasgow genealogy centre tends to be well booked up in advance, but there is usually plenty of room in Edinburgh.
(c) In Edinburgh you can do a two-hour free taster session. Otherwise you pay £10 for a day's unlimited access to all the BM&D certificates (in image form) and you can make whatever notes you like. The Glasgow genealogy centre charge is £14 per day.
(d) Other family history centres/shops/whatever don't have access to the BM&D certificates or indexes.
(e) Main registrars' offices have access to the computerised index and images, but they don't all have facilities for visitors and if they have they will charge you £10
per hour[/b] for the privilege
(f) The new Highland genealogy centre in Inverness may have similar facilities to the Glasgow one, but I have not yet been there so I don't know.