If you are not afraid of fluid engineering you can make a hydragas pump quite cheaply.
High pressure can be dangerous if treated unwisely.
I have just commissioned this useful tool, and am very pleased with the results. Though I spent more, the basics, bought new, are to be had for about £70 which is a lot less than the pukka pumps.
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It is an oil gun with a T-piece to accommodate the unnecessary luxury of a pressure guage (both parts from
http://www.pressureguage.co.uk c.£33 delivered). The low loss connector made by Schrader (possibly cheaper source) came from
http://www.prosol.co.uk c.£50 delivered. The connector's thread is 3/8 UNF. Many oil guns are available from well under £20 (but I already had one), finding one with the 3/8 UNF gives you a straightforward screw together tool. I added a couple of turns of plummer's PTFE tape to proof each screw connection. Hydraulic threads tend to be British Standard Pipe (BSP) or Unified Fine Thread (UNF) The common sizes of which can be bought in one tap & die kit from Machine Mart (kit CHT304 includes the metric range as well as BSP and UNF c.£38).
This beast can probably pump watery liquid well over 2000 psi safely, it is rated at c.6000 for oil - I only need c.400 psi for the Fs - so I can pump them up in the cold weather and get much better headlight beam pattern, then let them back down again in the summer.
Woohoo ;o)
I am starting to feel old!