There are a goodly number of places, at varying price and quality, where one may purchase Charlie Chan movies on video tape and/or DVD. If you will go to our "Charlie Chan Links" and then scroll down to "Charlie Chan Movies" you will find a fairly long list of sellers, most of whom offer ALL available Chan films.
You might also check the many tapes for sale on ebay. The prices vary from very reasonable to a bit high to too much, but, that is perhaps worth a try as well.
Such places as www.amazon.com offer a number of commercially produced Charlie Chan video tapes. Once at their site, just type "Charlie Chan" in their search window.
I hope that these few suggestions will be of some help to you in your search. If you have any further questions, please do not hesitate to ask!