I could not find a source of Fresnel Lens (and some other small survuval tools) in Canada which lead me to purchasing the DR/AMK PSK which has many compact items in it for a reasonable price.
Since then I have found credit card size Fresnel Lens at electronic stores, I think a pack of 2 cost about $5.00.
Last summer I recieved a mass mailout from the Canadian National Institute for the Blind (CNIB) and in it was a very thin Fresnel Lens, a nice "Thank You" for a donation; I now carry this lens in my wallet.
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