Netflow/sFlow generator for Linux with BGP support

Hi there I'm currently switching from MikroTik CCR 1009 to SuperMicro 5018D-FN8T as small router. Now I'd love to integrate BGP infos into netflow/sflow, as MikroTik still doesn't have any support for that. Are there any alternatives to nProbe (which supports BGP but is ways too expensive with its 300€)? Regards Patrick