We used a company called TwoHeads and they were excellent, even to the extent that when we got to our apartment building and it was all closed up our driver took it upon himself to sort out the problem with the owners and get us relocated, with him we would have been absolutely stranded.
If you hover your mouse over their name you should see the e-mail address appear in the bottom left hand corner of your browser window. You can make a note of it (excluding the 'mailto' and everything after the '?' )and then manually type it into your e-mail client?
Clicking on the link should automatically open your e-mail client but if you only use webmail then this may not work.
Party of 9 creates a problem, as most transfer companies use 8 +1 (driver) so you may be committed to hiring two vehicles. This will still be more economic to hiring a 23 seater...
If you were to consider renting a bus, the maximum you could drive on a normal licence would again be 8 + 1... so you could effectively get your party to Bansko if you drove, not as hectic as it seems, and you would have transport here....
18lv now, and you will need to get to the central bus station in Sofia, which can if going by taxi cost 20-30lv if there were only 3 of you, 9 likely to be in the region of 90lv. You will then need to get a taxi from the bus station in Bansko to your accomadation, unless you wish to walk...
So if you consider 9 x 18lv = 172lv + 90lv 3taxi(Sofia) + 60lv 3taxi(Bansko) = 322lv one way, and a lot of hassle... only 3 buses a day direct to Bansko, otherwise a lot of waiting, it is possible to get ...
18lv now, and you will need to get to the central bus station in Sofia, which can if going by taxi cost 20-30lv if there were only 3 of you, 9 likely to be in the region of 90lv. You will then need to get a taxi from the bus station in Bansko to your accomadation, unless you wish to walk...
So if you consider 9 x 18lv = 172lv + 90lv 3taxi(Sofia) + 60lv 3taxi(Bansko) = 322lv one way, and a lot of hassle... only 3 buses a day direct to Bansko, otherwise a lot of waiting, it is possible to get a bus from the airport to the bus station, but a lot of waiting applies again...
Hire a 9 seater bus
Taxi from the airport to the bus station is never more than 12lv (Last time was 3-4 weeks ago) - not that it makes a huge difference in this case, but might be useful to others looking.