Family Tree DNA is having a DNA Day promotion on various products, beginning at 6PM Thursday April 18th and concluding at 11:59PM CDT on Monday April 22nd. Test kits can be ordered, and paid for, on-line at: http://www.worldfamilies.net/surnames/devlin/

For genealogy purposes, recommended tests for males are:
Y-DNA37 for $119.00US (Regular price would be $149)
Y-DNA67 for $199.00US (Regular price would be $239)

Males and females can participate in the Family Finder testing, and that test is priced at $169.00US. The price during the last sale was $199.00US.