Only problem is HPC's gears are the modern 20 degree pressure angle standard and Boxford / Myford etc are all the older 14.5 degree standard.
Also never put the words specials and cheap in the same paragraph when talking with HPC gears. Whilst the stock gears are reasonable there specials are based on someone in industry being broke down where speed and availability are forefront in respect of price.
For the metric translation gears they often come up on ebay under Southbend as opposed to Boxford.