Though the 3G-equipped version of the iPad will only be able to get data services from AT&T, Verizon apparently sees the introduction of Apple's tablet device as "an opportunity" for the company to sell data services. A supposed internal sales memo published by Engadget reveals Verizon's plan to push its MiFi mobile hotspot for the WiFi-only version of the iPad, which will be available April 3.

The memo points out that the WiFi + 3G iPad won't go on sale for at least a few weeks after the WiFi model, costs $130 more, and can only get service through AT&T, which the memo describes as "an overloaded network with limited coverage." Ouch.

To be fair, the extra $130 includes GPS hardware in addition to the 3G radios, and AT&T continues to make improvements to its network. But, if you don't want to wait, don't want to pay extra, or just don't want to use AT&T service, Verizon has a point—a mobile hotspot like the MiFi (which can connect up to 5 devices at once) can make a good alternative.

A MiFi 2200 from Verizon will run you $50 with current promotions and a two-year contract; without a contract expect to pay about $250. However, Verizon's plans aren't as generous or affordable as the data options AT&T offers for the iPad. Through AT&T, you'll pay $15 per month for up to 250MB of data or $30 per month for unlimited via AT&T, and those plans don't require a contract. With Verizon, you'll pay $40 per month for up to 250MB, or $60 per month with a 5GB cap. Prepaid, non-contract options start at $15 per day with a 75MB limit. Like AT&T, however, your plan also includes free access to Verizon WiFi hotspots.

Sprint offers a branded MiFi 2200 as well, though you can get it free after a $50 mail-in rebate. The company only offers one data plan, though: $60 per month with a 5GB cap (and a 300MB cap on roaming). Sprint also offers the Sierra Wireless Overdrive 4G/3G hotspot for those in an area with WiMAX coverage. Though it costs $100 after rebate, for the same $60 a month you'd get unlimited 4G data and 5GB of 3G data.

For a 4G-only option, you can go directly through Clear to get a 4G USB modem and a Clear Spot WiFi adapter that works with up to eight devices for under $200 total. Data plans start at $40 per month for 4G-only access, though bundles with home service or 3G fall-back are also available.

Other combinations of mobile data modems and/or mobile hotspots are also possible, and it's probably worth it to check with the provider in your area to see what options are available. Despite the extra cost of the WiFi + 3G iPad and the associated data plans, you're not likely to find a cheaper alternative. But going this route means you'll have data access for other devices, such as a laptop, iPod touch, or Nintendo DSi, and can serve data to multiple devices at the same time. The extra flexibility may fit your particular needs and justify the extra cost.

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