In Europe there are no cheap options, really. 3 names are well known, Norman van der Dussen, Facialteam and Dr van der Veen. But in all of these cases you wouold have to calculate with about 10000 EU for forehead-only FFS whicn would include some of the expenses for staying there. The bulk of the costs are hospital costs and they are not avoidable, the surgeries are less expensive, which is why it pays off to do them all in one run.
Cheaper options for you may be - getting german health insurance to cover for it somehow - usually they will try to deny this, but some peopple managed to get it paid for, usually then its not outside germany and there are few in Germany who do this, none of them have international reputation.
Alternatively, I can imagine cheaper options exist in eastern Europe or in Asia, but In those cases extra care has to be taken about the quality of the work!