I've been on the market for a full (100+ key) keyboard which is mechanical and low profile.
Have found Digidirect the most cost effective at $143, then add another $10 coupon discount from signing up to their mailing list OR creating your profile for the first time.
The traditional stores MSY/Umart Scorptec etc. have it at $149+
The SE edition of the K5 have made some minor improvements such as adjustable feet etc.
0.95% surcharge on card & PayPal payments.
Thank-you to the mystery admin who cleaned up my post :)