These fetch between 50 and 150, top HMVs slightly more. Floor standing machines can sometimes be bought cheaply, simply because no-one has room for them. Some late HMVs are valuable, but for others the sound and the look will either sell the machine, or not. These fakes retail for 50- 150, while a decent genuine HMV horn gramophone would be around 1000, depending on the model. Few HMV machines were sold with brass horns, and the horns on fake machines look like they were made yesterday - because they were.
Many fake machines use motors taken from old portable gramophones.
Some of these had winding handles that came out at an angle. All real horn gramophones have winding handles coming out horizontally. The sound box is the large circular part, on the end of the arm, which has a screw at the bottom to hold the needle that plays the record. The cheapest way is to buy a 1960s or 70s record player from a car boot sale which has a 78rpm setting, and a turnover stylus, where one side of the stylus plays 78s, while the other plays LPs. If there's a 78rpm setting on the deck, but no special 78 stylus, you'll still get a sound from the records, but it'll be a lot scratchier than using the 78 stylus.