In the United States online gambling (such as poker) is illegal and since raffles are gambling it would follow that online raffles would also be included in that ban.  However, I have not found a definitive answer to this question as of yet.

It is advised that anyone considering a raffle to consult with an attorney who has experience in this area.

That legal disclaimer being said, many charities do at least advertise their raffles online and have an address or contact information so people can order tickets.

For more information:

Online gambling in the United States information on Wikipedia

What are the raffle laws of each state?

Do you need to register in each state for online fundraising? from Idealware

There are a variety of raffle drums available such as those made out of brass and others that are clear made from acrylic materials.  You will want to estimate the number of tickets to be sold at your raffle and buy a drum that will be the right size.  Raffle drums can be bought at online stores such as RaffleDrums.com.

For low value items such as gift baskets, $1 per ticket is normal.

For mid level value items such as televisions and some travel, $5 per ticket is normal.

For the largest value prizes automobiles, boats, or large travel prizes $10-$20 per ticket is usually best. Some raffles which restrict the number of tickets sold will charge $50 or $100 per ticket. The logic is that the person buying the ticket has a better chance of winning and will be more likely to buy a ticket.

Deciding on the ticket price is an important step in your raffle planning. The ticket price should be related both to the value of the items and to the market that you will be selling tickets to. Charge too much and people will not want to buy… charge too little and your fundraiser will not be as successful as it could be.

Most raffles involve an organization selling a great number of tickets, each ticket at the same price. For example, a raffle ticket may be priced at $1 all the way up to $100. Sometimes an organization will offer a discount if people buy more than one ticket.

Prizes for a raffle can be travel, televisions, iPods, personal gift items or even cars and boats. The more valuable the prize, the higher the ticket price will be.

It is important to set all of the raffle rules in advance such as drawing date, whether the person needs to be present to win and so forth. At a pre-determined date, the winners are drawn from a container which has a copy of every raffle ticket. Winners are contacted and prizes are distributed.

In most cases raffles are conducted by charitable organizations and the net proceeds from the raffle must be devoted to a charitable or public service activity or endeavor. Laws vary from location to location (country, state/province, and city) but in most cases if the raffle does not benefit a charitable cause it is considered a lottery or gambling. Then different regulations are attached to the the program.