An alternative could be the open-path Fourier transform infrared spectroscopy (OP/FT-IR) or INNOVA 1412 photoacoustic field gas monitors (FGMs) (LumaSense Technologies).
Most systems used in methane and CO2 analysers for landfill gas use relatively simple non-dispersive IR gas analysers. FT instruments can be used but you really do not need anything so sophisticated. CO2 can be measured using a colorimetric method based on bicarbonate indicator. Analysers for methane based on heat produced when it is oxidised on a catalyst used to be available but they are no longer available (I think) and would not be sensitive enough.
There are low-cost semiconductor gas sensors on the market for CO2 and CH4, e.g. from Figaro Inc. At least for CH4 it has been shown they reflect trends in ambient methane reasonably well (Atmos. Meas. Tech., 5, 1925–1934, 2012), and thus may be used in chamber applications. However, a good calibration and elimination of temperature and humidity influence seems to be crucial, so testing against a reference instrument is advisable.
You can evaluate the new Ultra-Portable Greenhouse Gas Analyzer (CH4, CO2, H2O) produced by The Los Gatos Research - http://www.lgrinc.com/
Please consider that I haven't experience with this instrument and I am not expressing any evaluation about the performance or cost.
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