Help Please

[minty1]

I am new to the site and am looking for information and hopefully pictures to refer to.
I work for the NHS in a service supporting veterans. I am planning to make a display on Scottish Regimental cap badges and would like to get the correct badges. I am buying cap badges from e bay and am paying for all items myself. I am amazed how some members can tell if a badge is fake or not, which made me think if I've been paying too much for the badges already purchased. The quality isn't really an issue as the display is mainly going to be a visual history of Scottish Regiments. I currently have badges for Royal Scots, Royal Scots Fusiliers, Highland light infantry, Royal Highland Fusiliers, King's Own Scottish Borderers, Scottish Rifles, 90th Regiment of Foot, Cameronians, Black Watch, 93rd Regiment of Foot, Argyll & Sutherland Highlanders, Queen's Own Cameron Highlanders, 72nd Regiment of Foot, Seaforth Highlanders, Queen's Own Highlanders, 93rd Regiment of Foot, Gordon Highlanders, Royal Regiment of Scotland. Would I be correct in saying I would still need 42nd 71st & 73rd 74th and 75th Regiments of foot, who I think were formed and amalgamated into the regiments listed. can anyone advise how much I should be paying for the 42nd 71st & 73rd 74th and 75th, does anyone have pictures to make sure I have / am purchasing the correct badges. Thanks in advance.