There used to be advantages to the Advantage service but they have mostly gone away ( only the dedicated line is a marginal advantage if you remember to use that number - https://turbotax.intuit.com/personal-taxes/cd-download/advantage/) so buy the program from any reliable store/reseller you trust ... the price thru TT will only go up because they remove the discount as the season progresses however the other sellers will lower the price as the season goes on or have specials/coupons available.
CAUTION: There are a lot of scam sites, so do not try to purchase from any "too-good-to-be-true" discount site on the Internet that you find in a search. You might end up with pirated software, ID theft, malware, etc. Only a few large well-known sites like Amazon, NewEgg, Staples, Office Depot, etc., are authorized to sell TurboTax downloads.
