Today, all 44 individual state lotteries offer both Mega Millions and Powerball as a result of a 2009 agreement between the Mega Millions consortium and MUSL to cross-license their joint games to one another’s members, although the two organizations continue to administer Mega Millions and Powerball separately. D.C. and the U.S. Virgin Islands also offer both games. Only the Puerto Rico Lottery offers only Powerball and not Mega Millions.

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Yes - this is known as "pooling" or "syndication". A group of family members, friends, or colleagues put funds together to purchase more tickets, and then equally share out any prizes they win. Bear in mind, one nominated person will have to act as the ticket holder, and it's important that they are reliable and trustworthy. You should also have a binding legal agreement.
In January 2012, Mega Millions' rival Powerball was altered; among the changes were a price increase of $1 for each play, as a result, a base game costs $2, or $3 with the Power Play option. At the time, there were no plans to change the price of a Mega Millions play, with or without the Megaplier (see below for the 2017 format change that includes the base price for a Mega Millions play to be raised to $2.) The price increase for playing Powerball was a major factor in Louisiana deciding to pursue joining Mega Millions, as that state's lottery joined Mega Millions on November 16, 2011.
This website and the games available thereon are operated by Kootac. Kootac Trading Limited, with its registered office at No. 30, Kenilworth, Flat 3, Sir Augustus Bartolo Street, Ta' Xbiex, XBX 1093, Malta (EU) is licensed by the UK Gambling Commission to operate remote gambling in Great Britain under licence number 000-044791-R-324883-004. Kootac N.V., with its registered office at Heelsumstraat 51 E-commerce Park, Curacao is officially licensed by the Government of Curacao to operate online gambling based on the licence number 8048/JAZ2013-014.
This method specifically has faced criticism recently from a number of lottery organizers such as Camelot, the UK National Lottery organizers who are not happy with companies “selling tickets” (selling bets on outcomes of their established lottery draws) for prices sometimes even cheaper than Camelot themselves sells their tickets. This legal and corporate dispute looks set to continue for the foreseeable future, in the mean time you can continue to buy Powerball tickets online, only now you are aware of the key differences between the two business models. 
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