Please, dear, do not sell yourself into slavery. If you buy your visa your sponsor will have complete control to abuse and exploit you since you will be in the country illegally. You will have no recourse when it comes to seeking help. He will extort money from you and possibly even more unpleasant things. No one will hire you if they know you have an illegal visa and your sponsor wouldn't agree to transfer you - why should he when he can demand hundreds or thousand of riyals a month from you.