Re: LF1 has NON-STANDARD USB port!
Adorama and B&H have the Panasonic retractable USB cable (DMW-USBC1) in stock, for US$14.95.
Panasonic lists that cable for over US$20, but also specifies cable # K1HY08YY0034 as compatible, which it lists for only US$4.02. It has this cable (in the US) "Back-ordered ETA: 07/24/13".
I believe Monoprice has a compatible cable for US$1.50:
http://www.monoprice.com/products/product.asp?c_id=103&cp_id=10303&cs_id=1030314&p_id=2735&seq=1&format=2
Monoprice sells good quality cables for low prices. Ive have been happy with them in the past. I just ordered one of these cables (above) and will post whether it works on my LF1 when I receive it.
Hmm, you're right, Adorama and B&H do sell the retractable one $5 cheaper (and Panasonic does sell it for the same equally steep $20 as Amazon)... Those two places also charge shipping tho so you only end up saving about $1-2, but hey, a buck's a buck. I might end up giving in and getting that one, nicer to pack in my bag and the LF1 should last me 2-3 years anyway.
Panasonic could do a much better job of branding and identifying these cables IMO, specially if they've been using a proprietary one for a while, if at least on their own site... B&H and several other places describe it as micro USB B or something when it's unequivocally NOT any of the two micro standards. The K1HY08YY0034 you mention (listed on the LF1 manual) also has no compatibility info whatsoever on Panasonic's own site and you have to go thru the more obscure parts department to get it. It's all kinda poorly managed IMO.
I use Monoprice a ton for audio/video/USB/ethernet cables too, I actually ordered a 6" micro HDMI male to full size HDMI female cable (PID 7603) off them in anticipation of the LF1, that way I can adapt any full size HDMI cable but since the large female plug is down the cable/adapter end it avoids the kludge of having a bulky adapter + cable connector hanging directly off the camera port. Wish I could find a similar one for my mini HDMI devices, Monoprice doesn't have a great solution for those (I got a hinged mini to female-full adapter elsewhere).
Anyway, I'm not sure that MP cable you pointed out is compatible... If you look at the camera model numbers listed, none of them seem to be listed on Panasonic's long list for the retractable DMW-USBC1... Maybe it's just coincidence and Monoprice only has some really really old models listed, but Panasonic HAS changed the cable they use in the past at least once thru the product line history (I think the plug's the same even, but the pins changed).
Let us know if it works! I'm always ordering stuff from MP, for $1.50 I'd just throw it into the next order regardless of what else I've bought.