If you go to this link, it should give you $100 off: https://marketing.homedna.com/acton/media/30015/history18; if it doesn’t, use promo code HISTORY18. Sale price $99.00. Regular price $199.00. Added to Current October 2018 DNA Sales.
$100 OFF GPS Origins | Promo Code HISTORY18
Offer valid through October 23, 2018 11:59 pm EST. Must use promo code HISTORY18 to receive discount in cart. $100 discount taken from product SRP of $199. Offer valid only at HomeDNA.com and is only available for the GPS Origins Ancestry Test. Not valid when you upload your raw data. Not valid on prior purchases. Other conditions may apply.
If you scroll down the above link, it gives comparisons between GPS Origins, AncestryDNA, FamilyTree DNA (FTDNA), and 23andMe. The biggest thing missing from GPS Origins is matching. The other companies allow matching on their sites. It appears you can upload the results from GPS Origins to GEDmatch Genesis, which will give you some level of matching ability.