The standard mag slidy is £115, so expect to pay £15-£20 more for the supermag I guess (or probably the same as a 525 T mag)
However, you may be better looking at one of the Penn combo deals that are on the go, you will get a decent beachcaster and a so called "Free" 525 supermag usually with free line and shockleader thrown in as well.
This option looks like it starts at £175 at Veals.
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