Satellite broadband costs widely differ from company to company. many big names who are offering low prices, seem to have hidden set up costs or tie you down to a 2 year contract.
Also to take into consideration is asking your satellite broadband provider about contention ratios. this is how many people the link is going to be shared with. the larger companies who offer a cheaper price often increase the contention ratio so you may not be getting the speeds you have paid for.
One last thing to consider is what satellite the signal is coming from. research is definitely needed on this matter. We are using the Hylas1 satellite that can be considered to be the more reliable and professional solution, many businesses op especially for this system as it has a good reputation.
If you would like to know anything else about satellite broadband systems I am happy to help.!