as for the pipa pipas, WEIRD! hahaha... most LPS's dont carry Eheim. Theyre a high end brand that doesnt sell too well in america except amongst more serious aquarists(hope that doesnt somehow sound condescending
thats a great price for drilling holes. Id probably use the guy if he was local to me! they charge like $50- $75 here! for the size, just measure the outside diameter of the bulkhead/s you plan on using for the pipe size. most of them also come with a sticker that has the dimensions on them. these are the ones I use
Slip Bulkhead Fitting Kits