Special ended but there are domains left. Also could be good as a domain investment.
Proces to negotiate - bigger price-offs possible depending on domain. Bulk proce-offs!
Check actual domains list here:
http://1-single-letter-domains.com/#online
Some sales to compare according to NameBio.com:
dma.online - 5000 USD
lasvegas.online - 4750 USD
fay.online - 3500 USD
expeditions.online - 2210 USD
lodges.online - 1622 USD