$7.49/month/128M/5G space/unlimited traffic/Xen VPS —— RapidXen

RapidXen is an American hosting service company specializing in Xen VPS. It is affiliated with SystemInPlace and has been providing services since 2006. The company's founder, William Pitcock/nenolod, is a well-known Debian developer and code maintainer with a strong technical background.
RapidXen's VPS has the following configurations:

RAM	Swap	Disk	VCPUs	Monthly cost	Yearly cost
128 MB	256 MB	5 GB	1	$7.49	$71.90 (save 20%)
192 MB	576 MB	15 GB	1	$14.99	$143.90 (save 20%)
256 MB	768 MB	20 GB	1	$19.99	$191.90 (save 20%)
512 MB	768 MB	20 GB	1	$29.99	$287.90 (save 20%)
512 MB	1536 MB	40 GB	2	$45.99	$441.50 (save 20%)

Overall, it feels a bit expensive.
RapidXen has data centers in Los Angeles, Chicago, and Germany.
Test IP:

Los Angeles: 204.152.222.222
Chicago: 67.202.104.180
Germany: 95.168.182.184

RapidXen official website: http://rapidxen.net/