Pricing for jet cards varies by provider and by the size of aircraft. Some providers quote prices that include fuel fees and others quote prices that exclude fuel fees so make sure to ask about all aspects so that you are comparing apples to apples. See this article for a detailed comparison of jet cards and all the factors to consider.
The major fractional providers and large fleet operators, such as NetJets and Flexjet, provide time on their own fleets to their jet card holders. So generally with these companies you'll be flying on an aircraft that they own, manage and control. They also tend to be newer aircraft. The charter companies jet card holders fly on aircraft selected by the charter company, but these companies typically do not own or operate their own aircraft.
For a typical 25 hour jetcard on a light jet the prices are in the range of $120,000 to $150,00 range. For example Flight Options price for 25 hours on a Nextant 400XT is $132,500, but this excludes fuel fees. NetJets price on the Phenom 300 starts at about $172,000 and this includes fuel fees but excludes any fuel surcharges. Both quoted prices exclude federal excise taxes (FET).
At NetJets a 25 hour jet card on a Citation Latitude starts at about $210,000 plus FET and any fuel surcharges need to be added. At Flight Options a 25 hour jet card on a Citation X is $170,500 plus FET and all fuel charges. Private Jet Services charges $166,250 for 25 hours on their "Mid Priority" (somewhat older aircraft) or $183,875 on their "Mid Elite" (newer aircraft). Both of these include FET and fuel surcharges.
NetJets price for 25 hours on a Gulfstream G450 is $363,900 and includes basic fuel charges, but FET and any fuel surcharges are extra. Private Jet Services has an hourly price of $11,050 for heavy aircraft in their "Priority" program and includes FET and fuel surcharges.
In comparing any jet card pricing, make sure you are comparing apples to apples. Different providers include or exclude different charges in the main, headline prices they quote. Other features may also differ from provider to provider, including the age and type of th aircraft.