I believe you can get it through your cell phone provider at a reasonable price. If not, you can check Amazon.com for their prices. But I am pretty sure that your cell phone or tablet provider would be your best option.
buy an iPhone
You can have a mobile wifi hotspot connected to a mobile network. You can buy these off Major Carriers.
Yes, you can use your Galaxy S3 as a mobile hotspot. However, your cellular carrier may require a monthly mobile hotspot plan in order for the hotspot to function.
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Mobile Hotspot Mifi is not a cell provider. The Mobile Hotspot Mifi is a product made by a cell phone company that is portable, small, convienent, and offers wifi on the go style.
The CEO of Hotspot Mobile is John Legere. He has been with the company since its creation. The success of the corporation can be attributed to his vision.
You can find reviews on the 3G mobile hotspot on its own website as well as sites such as http://www.techrepublic.com/blog/smartphones/review-palm-pre-plus-3g-mobile-hotspot/1229 and http://reviews.sprint.com/5611v2/248/overdrive-3g-4g-mobile-hotspot-by-sierra-wireless-reviews/reviews.htm
Try the website for T-Mobile.
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Mint Mobile lets you buy in bulk for big savings with unlimited talk, text and data plans. Mint Mobile sells service in three, six, and 12-month chunks; the more you pay for in advance, the cheaper the monthly service. Plans start as low as $15/month cutt.ly/vjw17sM
An LTE mobile hotspot is a device that can be plugged into your mobile phone or laptop through a capable USB port. This gives the device mobile wifi internet that can be accessed wirelessly. It's like internet wherever you go.