Angelsounds fetal doppler, $20 identical to this one:

http://www.ebay.com/itm/Angelsounds-Fetal-Doppler-3MHz-Probe-Baby-Heart-Monitor-Backlight-LCD-/271270302728?pt=LH_DefaultDomain_0&hash=item3f28f85408

Rarely used, big bottle of gel included. Shipping $5.