Best analog high pass filter for low $

Likely I will go high level connection from amp to sub and just let the sub bass fill in where the mains can't quite hit (15-40Hz or so)
But, doing all sorts of research and thinking about different ways of connecting got me thinking about how IF I did decide to go with RCA and offloading some of the bass that the Mains CAN hit to the SUB, then what would be the best way to do this without going digital (NO ADA conversion please!). I assume this can be done with a high pass filter, but which one is a good all analog x-over that could do a good job without degrading the SQ substantially? I saw the Outlaw Audio ICMB, but it looks like that has been discontinued. Are there any other good options under $300 that I should know about similar to the old Outlaw unit?

BTW...Another option is Vandy 2wqs - they have their own connection system that is pretty freakin' cool and I have definitely not ruled out that option either. Just trying to figure out ALL my options.

You can implement a first order high pass filter with a single series capacitor.

Given the high impedance of most amps, you can get a very very good cap relatively cheap.

Would this be a DIY type of thing? Is there one I can buy that is ready to go?
That Hsu looks nice! and only $100. Looks good, what x-over options did you get? I assume 80HZ? What else?

Also, I noticed that it's only a 2nd order x-over. Does anyone know of a good, inexpensive 1st order x-over?
Need to know input impedence of the amp to calculate needed cap value.
you can buy the temporary grade or finished higher grade values from a Vandersteen dealer
or as some others point out a DIY project

i would use a WIMA and bypass that with a Rel cap or better

I got the 80 and 60. I use the 60!
Tomic, this is what I got for input impedance on my amp: 10K ohm unbalanced, 20K ohm balanced.

Based off that any recommendations? Also, a little confused on the WIMA and rel cap statement....Thanks
If a 1st order high-pass filter is steep enough for you (6dB/octave), a cap can be installed on the input jacks of your power amp (inside the chassis is the common choice). Creating the filter thusly saves the cost of both a x/o and an extra set of inter-connects. The formula for determining the cap value is available via a Google search, and requires the desired "elbow" frequency and the input impedance of your amp. This is the most transparent means of creating the filter.