I think you may find that these hoses are not that bad priced at the dealer.
Have a look at this part drawing;
http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=210072%5F45P&M=119980&GA=722%2E625&VIN=%2A&CT=M&cat=518&SID=14&SGR=030&SGN=02
For instance, part 144, which should be the combined hose that you need,
should be around $40.
Or like here ~$27;
http://www.**********.com/Part-Number/Engine-Air-Hose-Valve-Cover-to-Intake-Manifold-__1190901982_ELA_673122FF.aspx
br,
syljua