Commercial PI coils for DIY projects

[GeoMax]

Hi,
can anyone recommend any commercially available PI coils (mono, DD or concentric etc) that can be used for DIY projects? A DIY project could be for example the MiniPulse, Surf PI or Baraccuda with modifications to connect the coils etc.

Thanks

[Carl-NC]

Any Minelab (or compatible) SD/GPX coil made since 1995 will work.