If your dose is less than 0.5ml we recommend using tuberculin (insulin) syringes which come with an attached needle - these can be obtained from Sigma Aldrich and Becton Dickinson. Make sure the graduations on the syringes are in ml (cc) to ensure the correct dose is administered. For larger doses, try to find syringes with a small dead space and a smooth plunger action as this makes injections easier.
Capillaries (callibrated micro-pipettes):
We use non-heparinized 50ul VITREX capillaries obtained from Camlab. It is best to use capillaries that are filled to a line rather than "total volume" capillaries as total volume capillaries do not have any space for flame-sealing the ends. (NB - you do not need the pipette bulb/filler shown in the diagram)
We generally ask for 100ul per sample to ensure that there is sufficient for all analyses.
If you are concerned about your ability to seal capillaries properly, sealing wax can be a useful secondary measure to prevent the capillaries from drying out (see 'Capillary Sealing'). Sealing wax can be obtained from craft shops and internet sites that sell calligraphy sets etc. You should get the 'candle-type' sticks with a string in the middle. Wax from candles or tea-lights is not suitable because it breaks off of the capillaries too easily.